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cosmopolitan/third_party/python/Lib/test/test_mmap.py
Justine Tunney a6baba1b07
Stop using .com extension in monorepo 
The WIN32 CreateProcess() function does not require an .exe or .com
suffix in order to spawn an executable. Now that we have Cosmo bash
we're no longer so dependent on the cmd.exe prompt.
2024-03-03 03:12:19 -08:00

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from test.support import (TESTFN, run_unittest, import_module, unlink,
requires, _2G, _4G, gc_collect, cpython_only)
import unittest
import os
import re
import itertools
import socket
import sys
import weakref
# Skip test if we can't import mmap.
mmap = import_module('mmap')
if __name__ == 'PYOBJ': import mmap
PAGESIZE = mmap.PAGESIZE
class MmapTests(unittest.TestCase):
def setUp(self):
if os.path.exists(TESTFN):
os.unlink(TESTFN)
def tearDown(self):
try:
os.unlink(TESTFN)
except OSError:
pass
def test_basic(self):
# Test mmap module on Unix systems and Windows
# Create a file to be mmap'ed.
f = open(TESTFN, 'bw+')
try:
# Write 2 pages worth of data to the file
f.write(b'\0'* PAGESIZE)
f.write(b'foo')
f.write(b'\0'* (PAGESIZE-3) )
f.flush()
m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
finally:
f.close()
# Simple sanity checks
tp = str(type(m)) # SF bug 128713: segfaulted on Linux
self.assertEqual(m.find(b'foo'), PAGESIZE)
self.assertEqual(len(m), 2*PAGESIZE)
self.assertEqual(m[0], 0)
self.assertEqual(m[0:3], b'\0\0\0')
# Shouldn't crash on boundary (Issue #5292)
self.assertRaises(IndexError, m.__getitem__, len(m))
self.assertRaises(IndexError, m.__setitem__, len(m), b'\0')
# Modify the file's content
m[0] = b'3'[0]
m[PAGESIZE +3: PAGESIZE +3+3] = b'bar'
# Check that the modification worked
self.assertEqual(m[0], b'3'[0])
self.assertEqual(m[0:3], b'3\0\0')
self.assertEqual(m[PAGESIZE-1 : PAGESIZE + 7], b'\0foobar\0')
m.flush()
# Test doing a regular expression match in an mmap'ed file
match = re.search(b'[A-Za-z]+', m)
if match is None:
self.fail('regex match on mmap failed!')
else:
start, end = match.span(0)
length = end - start
self.assertEqual(start, PAGESIZE)
self.assertEqual(end, PAGESIZE + 6)
# test seeking around (try to overflow the seek implementation)
m.seek(0,0)
self.assertEqual(m.tell(), 0)
m.seek(42,1)
self.assertEqual(m.tell(), 42)
m.seek(0,2)
self.assertEqual(m.tell(), len(m))
# Try to seek to negative position...
self.assertRaises(ValueError, m.seek, -1)
# Try to seek beyond end of mmap...
self.assertRaises(ValueError, m.seek, 1, 2)
# Try to seek to negative position...
self.assertRaises(ValueError, m.seek, -len(m)-1, 2)
# Try resizing map
try:
m.resize(512)
except SystemError:
# resize() not supported
# No messages are printed, since the output of this test suite
# would then be different across platforms.
pass
else:
# resize() is supported
self.assertEqual(len(m), 512)
# Check that we can no longer seek beyond the new size.
self.assertRaises(ValueError, m.seek, 513, 0)
# Check that the underlying file is truncated too
# (bug #728515)
f = open(TESTFN, 'rb')
try:
f.seek(0, 2)
self.assertEqual(f.tell(), 512)
finally:
f.close()
self.assertEqual(m.size(), 512)
m.close()
def test_access_parameter(self):
# Test for "access" keyword parameter
mapsize = 10
with open(TESTFN, "wb") as fp:
fp.write(b"a"*mapsize)
with open(TESTFN, "rb") as f:
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_READ)
self.assertEqual(m[:], b'a'*mapsize, "Readonly memory map data incorrect.")
# Ensuring that readonly mmap can't be slice assigned
try:
m[:] = b'b'*mapsize
except TypeError:
pass
else:
self.fail("Able to write to readonly memory map")
# Ensuring that readonly mmap can't be item assigned
try:
m[0] = b'b'
except TypeError:
pass
else:
self.fail("Able to write to readonly memory map")
# Ensuring that readonly mmap can't be write() to
try:
m.seek(0,0)
m.write(b'abc')
except TypeError:
pass
else:
self.fail("Able to write to readonly memory map")
# Ensuring that readonly mmap can't be write_byte() to
try:
m.seek(0,0)
m.write_byte(b'd')
except TypeError:
pass
else:
self.fail("Able to write to readonly memory map")
# Ensuring that readonly mmap can't be resized
try:
m.resize(2*mapsize)
except SystemError: # resize is not universally supported
pass
except TypeError:
pass
else:
self.fail("Able to resize readonly memory map")
with open(TESTFN, "rb") as fp:
self.assertEqual(fp.read(), b'a'*mapsize,
"Readonly memory map data file was modified")
# Opening mmap with size too big
with open(TESTFN, "r+b") as f:
try:
m = mmap.mmap(f.fileno(), mapsize+1)
except ValueError:
# we do not expect a ValueError on Windows
# CAUTION: This also changes the size of the file on disk, and
# later tests assume that the length hasn't changed. We need to
# repair that.
if sys.platform.startswith('win'):
self.fail("Opening mmap with size+1 should work on Windows.")
else:
# we expect a ValueError on Unix, but not on Windows
if not sys.platform.startswith('win'):
self.fail("Opening mmap with size+1 should raise ValueError.")
m.close()
if sys.platform.startswith('win'):
# Repair damage from the resizing test.
with open(TESTFN, 'r+b') as f:
f.truncate(mapsize)
# Opening mmap with access=ACCESS_WRITE
with open(TESTFN, "r+b") as f:
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_WRITE)
# Modifying write-through memory map
m[:] = b'c'*mapsize
self.assertEqual(m[:], b'c'*mapsize,
"Write-through memory map memory not updated properly.")
m.flush()
m.close()
with open(TESTFN, 'rb') as f:
stuff = f.read()
self.assertEqual(stuff, b'c'*mapsize,
"Write-through memory map data file not updated properly.")
# Opening mmap with access=ACCESS_COPY
with open(TESTFN, "r+b") as f:
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_COPY)
# Modifying copy-on-write memory map
m[:] = b'd'*mapsize
self.assertEqual(m[:], b'd' * mapsize,
"Copy-on-write memory map data not written correctly.")
m.flush()
with open(TESTFN, "rb") as fp:
self.assertEqual(fp.read(), b'c'*mapsize,
"Copy-on-write test data file should not be modified.")
# Ensuring copy-on-write maps cannot be resized
self.assertRaises(TypeError, m.resize, 2*mapsize)
m.close()
# Ensuring invalid access parameter raises exception
with open(TESTFN, "r+b") as f:
self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize, access=4)
if os.name == "posix":
# Try incompatible flags, prot and access parameters.
with open(TESTFN, "r+b") as f:
self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize,
flags=mmap.MAP_PRIVATE,
prot=mmap.PROT_READ, access=mmap.ACCESS_WRITE)
# Try writing with PROT_EXEC and without PROT_WRITE
prot = mmap.PROT_READ | getattr(mmap, 'PROT_EXEC', 0)
with open(TESTFN, "r+b") as f:
m = mmap.mmap(f.fileno(), mapsize, prot=prot)
self.assertRaises(TypeError, m.write, b"abcdef")
self.assertRaises(TypeError, m.write_byte, 0)
m.close()
def test_bad_file_desc(self):
# Try opening a bad file descriptor...
self.assertRaises(OSError, mmap.mmap, -2, 4096)
def test_tougher_find(self):
# Do a tougher .find() test. SF bug 515943 pointed out that, in 2.2,
# searching for data with embedded \0 bytes didn't work.
with open(TESTFN, 'wb+') as f:
data = b'aabaac\x00deef\x00\x00aa\x00'
n = len(data)
f.write(data)
f.flush()
m = mmap.mmap(f.fileno(), n)
for start in range(n+1):
for finish in range(start, n+1):
slice = data[start : finish]
self.assertEqual(m.find(slice), data.find(slice))
self.assertEqual(m.find(slice + b'x'), -1)
m.close()
def test_find_end(self):
# test the new 'end' parameter works as expected
f = open(TESTFN, 'wb+')
data = b'one two ones'
n = len(data)
f.write(data)
f.flush()
m = mmap.mmap(f.fileno(), n)
f.close()
self.assertEqual(m.find(b'one'), 0)
self.assertEqual(m.find(b'ones'), 8)
self.assertEqual(m.find(b'one', 0, -1), 0)
self.assertEqual(m.find(b'one', 1), 8)
self.assertEqual(m.find(b'one', 1, -1), 8)
self.assertEqual(m.find(b'one', 1, -2), -1)
self.assertEqual(m.find(bytearray(b'one')), 0)
def test_rfind(self):
# test the new 'end' parameter works as expected
f = open(TESTFN, 'wb+')
data = b'one two ones'
n = len(data)
f.write(data)
f.flush()
m = mmap.mmap(f.fileno(), n)
f.close()
self.assertEqual(m.rfind(b'one'), 8)
self.assertEqual(m.rfind(b'one '), 0)
self.assertEqual(m.rfind(b'one', 0, -1), 8)
self.assertEqual(m.rfind(b'one', 0, -2), 0)
self.assertEqual(m.rfind(b'one', 1, -1), 8)
self.assertEqual(m.rfind(b'one', 1, -2), -1)
self.assertEqual(m.rfind(bytearray(b'one')), 8)
def test_double_close(self):
# make sure a double close doesn't crash on Solaris (Bug# 665913)
f = open(TESTFN, 'wb+')
f.write(2**16 * b'a') # Arbitrary character
f.close()
f = open(TESTFN, 'rb')
mf = mmap.mmap(f.fileno(), 2**16, access=mmap.ACCESS_READ)
mf.close()
mf.close()
f.close()
@unittest.skipUnless(hasattr(os, "stat"), "needs os.stat()")
def test_entire_file(self):
# test mapping of entire file by passing 0 for map length
f = open(TESTFN, "wb+")
f.write(2**16 * b'm') # Arbitrary character
f.close()
f = open(TESTFN, "rb+")
mf = mmap.mmap(f.fileno(), 0)
self.assertEqual(len(mf), 2**16, "Map size should equal file size.")
self.assertEqual(mf.read(2**16), 2**16 * b"m")
mf.close()
f.close()
@unittest.skipUnless(hasattr(os, "stat"), "needs os.stat()")
def test_length_0_offset(self):
# Issue #10916: test mapping of remainder of file by passing 0 for
# map length with an offset doesn't cause a segfault.
# NOTE: allocation granularity is currently 65536 under Win64,
# and therefore the minimum offset alignment.
with open(TESTFN, "wb") as f:
f.write((65536 * 2) * b'm') # Arbitrary character
with open(TESTFN, "rb") as f:
with mmap.mmap(f.fileno(), 0, offset=65536, access=mmap.ACCESS_READ) as mf:
self.assertRaises(IndexError, mf.__getitem__, 80000)
@unittest.skipUnless(hasattr(os, "stat"), "needs os.stat()")
def test_length_0_large_offset(self):
# Issue #10959: test mapping of a file by passing 0 for
# map length with a large offset doesn't cause a segfault.
with open(TESTFN, "wb") as f:
f.write(115699 * b'm') # Arbitrary character
with open(TESTFN, "w+b") as f:
self.assertRaises(ValueError, mmap.mmap, f.fileno(), 0,
offset=2147418112)
def test_move(self):
# make move works everywhere (64-bit format problem earlier)
f = open(TESTFN, 'wb+')
f.write(b"ABCDEabcde") # Arbitrary character
f.flush()
mf = mmap.mmap(f.fileno(), 10)
mf.move(5, 0, 5)
self.assertEqual(mf[:], b"ABCDEABCDE", "Map move should have duplicated front 5")
mf.close()
f.close()
# more excessive test
data = b"0123456789"
for dest in range(len(data)):
for src in range(len(data)):
for count in range(len(data) - max(dest, src)):
expected = data[:dest] + data[src:src+count] + data[dest+count:]
m = mmap.mmap(-1, len(data))
m[:] = data
m.move(dest, src, count)
self.assertEqual(m[:], expected)
m.close()
# segfault test (Issue 5387)
m = mmap.mmap(-1, 100)
offsets = [-100, -1, 0, 1, 100]
for source, dest, size in itertools.product(offsets, offsets, offsets):
try:
m.move(source, dest, size)
except ValueError:
pass
offsets = [(-1, -1, -1), (-1, -1, 0), (-1, 0, -1), (0, -1, -1),
(-1, 0, 0), (0, -1, 0), (0, 0, -1)]
for source, dest, size in offsets:
self.assertRaises(ValueError, m.move, source, dest, size)
m.close()
m = mmap.mmap(-1, 1) # single byte
self.assertRaises(ValueError, m.move, 0, 0, 2)
self.assertRaises(ValueError, m.move, 1, 0, 1)
self.assertRaises(ValueError, m.move, 0, 1, 1)
m.move(0, 0, 1)
m.move(0, 0, 0)
def test_anonymous(self):
# anonymous mmap.mmap(-1, PAGE)
m = mmap.mmap(-1, PAGESIZE)
for x in range(PAGESIZE):
self.assertEqual(m[x], 0,
"anonymously mmap'ed contents should be zero")
for x in range(PAGESIZE):
b = x & 0xff
m[x] = b
self.assertEqual(m[x], b)
def test_read_all(self):
m = mmap.mmap(-1, 16)
self.addCleanup(m.close)
# With no parameters, or None or a negative argument, reads all
m.write(bytes(range(16)))
m.seek(0)
self.assertEqual(m.read(), bytes(range(16)))
m.seek(8)
self.assertEqual(m.read(), bytes(range(8, 16)))
m.seek(16)
self.assertEqual(m.read(), b'')
m.seek(3)
self.assertEqual(m.read(None), bytes(range(3, 16)))
m.seek(4)
self.assertEqual(m.read(-1), bytes(range(4, 16)))
m.seek(5)
self.assertEqual(m.read(-2), bytes(range(5, 16)))
m.seek(9)
self.assertEqual(m.read(-42), bytes(range(9, 16)))
def test_read_invalid_arg(self):
m = mmap.mmap(-1, 16)
self.addCleanup(m.close)
self.assertRaises(TypeError, m.read, 'foo')
self.assertRaises(TypeError, m.read, 5.5)
self.assertRaises(TypeError, m.read, [1, 2, 3])
def test_extended_getslice(self):
# Test extended slicing by comparing with list slicing.
s = bytes(reversed(range(256)))
m = mmap.mmap(-1, len(s))
m[:] = s
self.assertEqual(m[:], s)
indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
for start in indices:
for stop in indices:
# Skip step 0 (invalid)
for step in indices[1:]:
self.assertEqual(m[start:stop:step],
s[start:stop:step])
def test_extended_set_del_slice(self):
# Test extended slicing by comparing with list slicing.
s = bytes(reversed(range(256)))
m = mmap.mmap(-1, len(s))
indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
for start in indices:
for stop in indices:
# Skip invalid step 0
for step in indices[1:]:
m[:] = s
self.assertEqual(m[:], s)
L = list(s)
# Make sure we have a slice of exactly the right length,
# but with different data.
data = L[start:stop:step]
data = bytes(reversed(data))
L[start:stop:step] = data
m[start:stop:step] = data
self.assertEqual(m[:], bytes(L))
def make_mmap_file (self, f, halfsize):
# Write 2 pages worth of data to the file
f.write (b'\0' * halfsize)
f.write (b'foo')
f.write (b'\0' * (halfsize - 3))
f.flush ()
return mmap.mmap (f.fileno(), 0)
def test_empty_file (self):
f = open (TESTFN, 'w+b')
f.close()
with open(TESTFN, "rb") as f :
self.assertRaisesRegex(ValueError,
"cannot mmap an empty file",
mmap.mmap, f.fileno(), 0,
access=mmap.ACCESS_READ)
def test_offset (self):
f = open (TESTFN, 'w+b')
try: # unlink TESTFN no matter what
halfsize = mmap.ALLOCATIONGRANULARITY
m = self.make_mmap_file (f, halfsize)
m.close ()
f.close ()
mapsize = halfsize * 2
# Try invalid offset
f = open(TESTFN, "r+b")
for offset in [-2, -1, None]:
try:
m = mmap.mmap(f.fileno(), mapsize, offset=offset)
self.assertEqual(0, 1)
except (ValueError, TypeError, OverflowError):
pass
else:
self.assertEqual(0, 0)
f.close()
# Try valid offset, hopefully 8192 works on all OSes
f = open(TESTFN, "r+b")
m = mmap.mmap(f.fileno(), mapsize - halfsize, offset=halfsize)
self.assertEqual(m[0:3], b'foo')
f.close()
# Try resizing map
try:
m.resize(512)
except SystemError:
pass
else:
# resize() is supported
self.assertEqual(len(m), 512)
# Check that we can no longer seek beyond the new size.
self.assertRaises(ValueError, m.seek, 513, 0)
# Check that the content is not changed
self.assertEqual(m[0:3], b'foo')
# Check that the underlying file is truncated too
f = open(TESTFN, 'rb')
f.seek(0, 2)
self.assertEqual(f.tell(), halfsize + 512)
f.close()
self.assertEqual(m.size(), halfsize + 512)
m.close()
finally:
f.close()
try:
os.unlink(TESTFN)
except OSError:
pass
def test_subclass(self):
class anon_mmap(mmap.mmap):
def __new__(klass, *args, **kwargs):
return mmap.mmap.__new__(klass, -1, *args, **kwargs)
anon_mmap(PAGESIZE)
@unittest.skipUnless(hasattr(mmap, 'PROT_READ'), "needs mmap.PROT_READ")
def test_prot_readonly(self):
mapsize = 10
with open(TESTFN, "wb") as fp:
fp.write(b"a"*mapsize)
f = open(TESTFN, "rb")
m = mmap.mmap(f.fileno(), mapsize, prot=mmap.PROT_READ)
self.assertRaises(TypeError, m.write, "foo")
f.close()
def test_error(self):
self.assertIs(mmap.error, OSError)
def test_io_methods(self):
data = b"0123456789"
with open(TESTFN, "wb") as fp:
fp.write(b"x"*len(data))
f = open(TESTFN, "r+b")
m = mmap.mmap(f.fileno(), len(data))
f.close()
# Test write_byte()
for i in range(len(data)):
self.assertEqual(m.tell(), i)
m.write_byte(data[i])
self.assertEqual(m.tell(), i+1)
self.assertRaises(ValueError, m.write_byte, b"x"[0])
self.assertEqual(m[:], data)
# Test read_byte()
m.seek(0)
for i in range(len(data)):
self.assertEqual(m.tell(), i)
self.assertEqual(m.read_byte(), data[i])
self.assertEqual(m.tell(), i+1)
self.assertRaises(ValueError, m.read_byte)
# Test read()
m.seek(3)
self.assertEqual(m.read(3), b"345")
self.assertEqual(m.tell(), 6)
# Test write()
m.seek(3)
m.write(b"bar")
self.assertEqual(m.tell(), 6)
self.assertEqual(m[:], b"012bar6789")
m.write(bytearray(b"baz"))
self.assertEqual(m.tell(), 9)
self.assertEqual(m[:], b"012barbaz9")
self.assertRaises(ValueError, m.write, b"ba")
def test_non_ascii_byte(self):
for b in (129, 200, 255): # > 128
m = mmap.mmap(-1, 1)
m.write_byte(b)
self.assertEqual(m[0], b)
m.seek(0)
self.assertEqual(m.read_byte(), b)
m.close()
@unittest.skipUnless(os.name == 'nt', 'requires Windows')
def test_tagname(self):
data1 = b"0123456789"
data2 = b"abcdefghij"
assert len(data1) == len(data2)
# Test same tag
m1 = mmap.mmap(-1, len(data1), tagname="foo")
m1[:] = data1
m2 = mmap.mmap(-1, len(data2), tagname="foo")
m2[:] = data2
self.assertEqual(m1[:], data2)
self.assertEqual(m2[:], data2)
m2.close()
m1.close()
# Test different tag
m1 = mmap.mmap(-1, len(data1), tagname="foo")
m1[:] = data1
m2 = mmap.mmap(-1, len(data2), tagname="boo")
m2[:] = data2
self.assertEqual(m1[:], data1)
self.assertEqual(m2[:], data2)
m2.close()
m1.close()
@cpython_only
@unittest.skipUnless(os.name == 'nt', 'requires Windows')
def test_sizeof(self):
m1 = mmap.mmap(-1, 100)
tagname = "foo"
m2 = mmap.mmap(-1, 100, tagname=tagname)
self.assertEqual(sys.getsizeof(m2),
sys.getsizeof(m1) + len(tagname) + 1)
@unittest.skipUnless(os.name == 'nt', 'requires Windows')
def test_crasher_on_windows(self):
# Should not crash (Issue 1733986)
m = mmap.mmap(-1, 1000, tagname="foo")
try:
mmap.mmap(-1, 5000, tagname="foo")[:] # same tagname, but larger size
except:
pass
m.close()
# Should not crash (Issue 5385)
with open(TESTFN, "wb") as fp:
fp.write(b"x"*10)
f = open(TESTFN, "r+b")
m = mmap.mmap(f.fileno(), 0)
f.close()
try:
m.resize(0) # will raise OSError
except:
pass
try:
m[:]
except:
pass
m.close()
@unittest.skipUnless(os.name == 'nt', 'requires Windows')
def test_invalid_descriptor(self):
# socket file descriptors are valid, but out of range
# for _get_osfhandle, causing a crash when validating the
# parameters to _get_osfhandle.
s = socket.socket()
try:
with self.assertRaises(OSError):
m = mmap.mmap(s.fileno(), 10)
finally:
s.close()
def test_context_manager(self):
with mmap.mmap(-1, 10) as m:
self.assertFalse(m.closed)
self.assertTrue(m.closed)
def test_context_manager_exception(self):
# Test that the OSError gets passed through
with self.assertRaises(Exception) as exc:
with mmap.mmap(-1, 10) as m:
raise OSError
self.assertIsInstance(exc.exception, OSError,
"wrong exception raised in context manager")
self.assertTrue(m.closed, "context manager failed")
def test_weakref(self):
# Check mmap objects are weakrefable
mm = mmap.mmap(-1, 16)
wr = weakref.ref(mm)
self.assertIs(wr(), mm)
del mm
gc_collect()
self.assertIs(wr(), None)
def test_write_returning_the_number_of_bytes_written(self):
mm = mmap.mmap(-1, 16)
self.assertEqual(mm.write(b""), 0)
self.assertEqual(mm.write(b"x"), 1)
self.assertEqual(mm.write(b"yz"), 2)
self.assertEqual(mm.write(b"python"), 6)
@unittest.skipIf(os.name == 'nt', 'cannot resize anonymous mmaps on Windows')
def test_resize_past_pos(self):
m = mmap.mmap(-1, 8192)
self.addCleanup(m.close)
m.read(5000)
try:
m.resize(4096)
except SystemError:
self.skipTest("resizing not supported")
self.assertEqual(m.read(14), b'')
self.assertRaises(ValueError, m.read_byte)
self.assertRaises(ValueError, m.write_byte, 42)
self.assertRaises(ValueError, m.write, b'abc')
def test_concat_repeat_exception(self):
m = mmap.mmap(-1, 16)
with self.assertRaises(TypeError):
m + m
with self.assertRaises(TypeError):
m * 2
class LargeMmapTests(unittest.TestCase):
def setUp(self):
unlink(TESTFN)
def tearDown(self):
unlink(TESTFN)
def _make_test_file(self, num_zeroes, tail):
if sys.platform[:3] == 'win' or sys.platform == 'darwin':
requires('largefile',
'test requires %s bytes and a long time to run' % str(0x180000000))
f = open(TESTFN, 'w+b')
try:
f.seek(num_zeroes)
f.write(tail)
f.flush()
except (OSError, OverflowError, ValueError):
try:
f.close()
except (OSError, OverflowError):
pass
raise unittest.SkipTest("filesystem does not have largefile support")
return f
def test_large_offset(self):
with self._make_test_file(0x14FFFFFFF, b" ") as f:
with mmap.mmap(f.fileno(), 0, offset=0x140000000, access=mmap.ACCESS_READ) as m:
self.assertEqual(m[0xFFFFFFF], 32)
def test_large_filesize(self):
with self._make_test_file(0x17FFFFFFF, b" ") as f:
if sys.maxsize < 0x180000000:
# On 32 bit platforms the file is larger than sys.maxsize so
# mapping the whole file should fail -- Issue #16743
with self.assertRaises(OverflowError):
mmap.mmap(f.fileno(), 0x180000000, access=mmap.ACCESS_READ)
with self.assertRaises(ValueError):
mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
with mmap.mmap(f.fileno(), 0x10000, access=mmap.ACCESS_READ) as m:
self.assertEqual(m.size(), 0x180000000)
# Issue 11277: mmap() with large (~4GB) sparse files crashes on OS X.
def _test_around_boundary(self, boundary):
tail = b' DEARdear '
start = boundary - len(tail) // 2
end = start + len(tail)
with self._make_test_file(start, tail) as f:
with mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ) as m:
self.assertEqual(m[start:end], tail)
@unittest.skipUnless(sys.maxsize > _4G, "test cannot run on 32-bit systems")
def test_around_2GB(self):
self._test_around_boundary(_2G)
@unittest.skipUnless(sys.maxsize > _4G, "test cannot run on 32-bit systems")
def test_around_4GB(self):
self._test_around_boundary(_4G)
def test_main():
run_unittest(MmapTests, LargeMmapTests)
if __name__ == '__main__':
test_main()
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